Australia's Biggest Loser host Ajay Rochester passionately kisses another woman as she shows off her much fuller figure in a pink bikini

She was once the host of Australia's Biggest Loser, for which she tirelessly battled with the bulge in order to keep her presenting gig.

Since her three year stint on the show, ending in 2009, Ajay Rochester's weight has fluctuated up and down.

Most recently and ironically, she appeared alongside Britney Spears's ex-Kevin Federline in yet another weight loss program, titled Excess Baggage.

Hand-in-hand: Australia's Biggest Loser host Ajay Rochester held hands with a mystery brunette and showed off her much fuller figure in a pink bikini during a day on Malibu beach earlier this month

On the reality TV contest she went in weighing in at 92.8kg (approximately 205 pounds), but significantly slimmed down upon her team taking the top prize.

Slimmed down: Ajay cut a much slimmer figure during her hosting stint on Australia's Biggest Loser. Here she is pictured in 2007

But now it appears that the 43-year-old blonde TV star has once again lost her battle with the bulge.

Rochester was spotted on a Malibu beach earlier this month showing off her fuller figure in a pink bikini.

She was also enjoying a romantic tryst with a mystery brunette.

The former presenter was seen wearing a 'hers and hers' matching purple sarong, sharing some Doritos chips with the woman, before they were seen enjoying a passionate embrace.

Her same-sex relationship comes after Rochester was once engaged to be married to British-born telecommunications manager Martin Gleave.

But she later called off the wedding and ended the relationship in August 2007.

Rochester's weight loss battle has been well documented in the Australian press.

In the past she has suffered from obesity, which she says led from the death of her birth mother and cutting ties with her abusive adoptive mother.

She went on to lose weight following the birth of her child Kai, now five, shedding over 50 kilograms (110 pounds) in the process.

Since then, she has been involved in several weight loss projects, most notably hosting The Biggest Loser.

After leaving Biggest Loser she once again gained weight, and admitted she used to starve herself to keep her presenting job.

Rochester also founded a weight loss website, The Healthy Body Club, and has written several books on dieting, including Confessions of a Reformed Dieter, Blubberguts and The Lazy Girl's Guide to Losing Weight and Getting Fit.

Rochester has recently made moves to have her adoption nullified after she was emotionally and physically abused at the hand of her adoptive mother several years ago.

'I am about to take the Australian Government to court to have my illegal adoption nullified and give me access to my original birth certificate as a legal document,' she told TheBorder Maillast month.

Passionate: The couple also shared a passionate kiss during the outing

Frolicking: The pair were pictured frolicking in the ocean

'The illegal adoption ruined mine and my mum's life and I will not sit by and let them just say "sorry" and not do anything to fix the lives they destroyed.'

She also told the publication that she would eat to comfort her from the trauma.

'I'll be honest. I use my weight to keep people away. I sabotage myself by putting on weight and I shut everyone out and use my weight as an excuse not to do so many things,' she said.

Snack: Ajay's companion fed the presenter Doritos chips

'I was so hurt by my past relationship that the thought of being that hurt just makes me terrified again.

'I think that's one of the main reasons I put on so much weight over the last few years. But also my whole life I have shut people out and I actually blame the adoption for that.

'The government recently apologised for the illegal adoptions from the `70s and I was one of those children and I think my weight gain relates a lot to the loss of my mother.'

Returning the favour: In return Ajay gave her companion a massage

"As much as I believe we should not be discriminated against or hated for our weight and we should love ourselves no matter what weight we are, there is no denying that if I don't lose weight soon, I may well just be a heart attack statistic.'

The bubbly blonde also addressed the issue of bullying in her interview.

'There is so much self hatred and public hatred/bullying about weight gain. We really need to understand that no matter what weight, shape, size, colour or creed we are, it's what is in our hearts that matters,' she said.

Battle: Ajay was the host of Australia's Biggest Loser from 2006-2009, for which she tirelessly battled with the bulge in order to keep her presenting gig

She revealed that she has been on diets since she was 12-year-old, when she became a ballet dancer and her teacher told her she was fat.

'My mum put me on a diet then and there and to make matters worse, it was some crazy fad diet where you only eat apples for two days, then chicken for two days ..' she said.

'I can't remember what else but I lost a little weight and like any fad, put it back on and started what would be a lifelong cycle of crash dieting and self hatred.'

On the red-carpet: Ajay attended an event in New York back in September and showed off her curves in a little black dress

Ironic: Ajay appeared on another Australian weight loss program Excess Baggage, alongside Britney Spears's ex-Kevin Federline at the start of this year

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Ajay Rochester passionately kisses another woman as she shows off her much fuller figure in a pink bikini